科技报告详细信息
Assessing Version 4 of the SMAP L4_SM Data Product
Reichle, R ; Liu, Q ; Koster, R ; Ardizzone, J ; Colliander, A ; Crow, W ; De Lannoy, G ; Kimball, J
关键词: SOIL MOISTURE;    CLIMATOLOGY;    WATER BALANCE;    WATER RUNOFF;    DATA CORRELATION;    PROVING;    PRECIPITATION MEASUREMENT;    IN SITU MEASUREMENT;   
RP-ID  :  GSFC-E-DAA-TN62702
学科分类:地球科学(综合)
美国|英语
来源: NASA Technical Reports Server
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【 摘 要 】

Version 4 of the SMAP Level 4 Surface and Root Zone Soil Moisture (L4_SM) product benefits from an improved land surface modeling system. Surface soil moisture is typically drier by several volumetric percent in Version 4 compared to Version 3, whereas root zone soil moisture is wetter in Version 4 in some regions and drier in others. Results from core validation site comparisons show that Version 4 of the L4_SM data product meets the accuracy requirement, which is formulated in terms of the RMSE after removal of the long-term mean difference (ubRMSE). The overall ubRMSE of the 3-hourly L4_SM data at the 9 km scale is 0.039 m3 m-3 for surface soil moisture and 0.029 m3 m-3 for root zone soil moisture, below the 0.04 m3 m-3 requirement. L4_SM surface and root zone soil moisture estimates are more skillful than model-only simulation estimates that are not informed by SMAP brightness temperature observations, with statistically significant improvements at the 5% level for surface soil moisture R and anomaly R values. Results from comparisons of the L4_SM product to in situ measurements from more than 400 sparse network sites corroborate the core validation site results.

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